Luminous electrical discharge tube



Feb. 24,1931. J. RISLER 1 1,793,720

LUMINOUS ELECTRICAL DISCHARGE TUBE Filed Aug. 8, 1927 INVENTOR waves R/J/er ATTORNEY nodule-ninja, or rams, runes; assronoa 'ro msmm coaronarron or o -"Flcem cs OI CITY, [18801731, A CORPORATION 01' DELAWARE Luminous anmc'rnrc'anmscrrmon rm Application filed August 8,

My present invention relates to luminous electrical discharge tubes and more articularly to tubes with means for coo g the electrodes. I

Inpractice the amount of current which 7 can-be passed throu h a luminous discharge tube, and co uen y the luminous capacity of the tube, is ted by the heating efiect produced by the current. This effect is ar- 10 ticularly pronounced at the electrodes. he object of my invention is to provide a means for cooling the electrodes so as to increase the luminous, capacity of electrical discharge tubes.

The discharge tubes of my. invention are constructed with perforated electrodes. Through the erforations in the electrodes and through t e walls of the discharge: tubes themselves planss vacuum tight pipes t rough which a coo g medium such as air or water mag be circulated.

cleareridea of the invention may be acquired by a consideration of the accompanying drawings which illustrate, partially d1a- .25 grammatically, certain forms of my mven tlon.

Fi s 1 and 2 represent the invention as apphed to a mercury vapor lamp. Here the tube 1, hascylindrical ends, 2 and 3, and is so equipped with lead in wires through the seals,

6. The electrodes proper are formed of metallic mercury contained in the cylinderical ends, 2 and 3. Passing through these electrode cylinders, 2 and 3, are tubes, 4 and 5 which are sealed vacuum tight through the walls of the cylinders, 2 and .3. Passage of a cooling medium, such as water or air, through 4 the tubes 4 and 5 cools the mercury electrodes contained in the cylinders'2 and 3. The lamp shown in Figure 2 is of the same gype as shown in Figure 1 but is especially esigned for use with air as a cooling medlum. Here the tubes 4 and 5 are connected by means of the tube 7 which contains perforations 8, that are so placed as to blow air on the mam body-of thelamp, 1. A single supply of air applied to the open end 0 tube 4 cools the whole lamp. The mercury lamps may suitable vitreous material, but I prefer to be formed of any 1927. Serial 110. $1 1,507.

make them of quartz because of the transparency and resistance to temperature changes shown by quartz.

Fi re 3. shows a -form of the invention suita le for roducing luminous discharges in gases. T e discharge tube, 9, has passing through its entire length a smaller cooling tube, 10, which is continued by means of vacuum ti ht joints through the ends of the tube 9. T e electrodes, 11, of copper or other suitable material are formed around the cooling tube 10. Passage of air or water or other cooling media through the tube 10 cools the whole lamp.

' What I claim and desire to secure by Letg5 ters Patent is: v

-1. A luminous electrical discharge tube including a body portion and ahollow electrode,

, and a tube extending alon the body having laterally directed ports or. discharging a aving cooling medium against the bod and an imperforate ortion extende through the hollow electro e, forconducting a vcooling medium through the electrode. I

2. In a luminous electrical discharge tube having cylindrical electrode containers at each end, a coolin tube extending through opposite end wa s of each container and sealed thereto and from one container to the other, said tube bein separate from the disgo charge tube for con ucting cooling medium throu h the electrode containers. 3. a device of the character described, including a luminous discharge tube having electrode containers at opposite ends, an electrodes in said containers, a cooling tube extending through opposite walls of the containers and from one container to the other along the exterior of the discharge tube and having ports insaid exterior portion for simultaneously cooling the electrodes and tube.

4. A luminous electrical discharge tube comprising an illuminating body portion ex-' posed to the atmosphere and having electrode chambers at each end containing fluid electrode material and means for cooling the electrode chambers and the electrode material comprising hollow tubes extending transversely of said body portion through said electrode chambers and beyond said chamloo 2 1,798,720 bersand throu h the electrode material contained in said 0 ambers.

5. A luminous electrical discharge lam including sealed electrode chambers at eac end, containing metallic mercury electrodes and an illuminatin body portion extending between the electro e chambers, hollow cooling tubes extending through and beyond the electrode chambers and through the mercury electrodes, and substantially at right angles to said illuminating body portion.

In testimony whereof I aflix my signature.

JACQUES RISLER. 

